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MIT 18.06 Linear Algebra, Spring 2010
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OpenStudy (anonymous):
In the MIT OCW Linear course: Regarding the recitation video "Computing the Four Fundamental Subspaces" ... the TA presents a Matrix in LU form and we are asked to find the rank and basis of each of the four fundamental subspaces. I multiplied L by U to get the matrix B, then found the rref of B to be the 3 x 3 identity matrix of rank 3. I computed the bases of the subspaces from this 3 x 3 identity matrix. What's wrong with this method? Thanks
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